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POWatin error - Unable to cast COM object of type 'mshtml.HTMLDocumentClass' to interface type 'mshtml.DispHTMLDocument'
 

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  1. POWatin error - Unable to cast COM object of type 'mshtml.HTMLDocumentClass' to interface type 'mshtml.DispHTMLDocument'
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    <p>I have been unable to solve this error in the WatiN.Core.IE constructor. This is WatiN 1.3, as I am using MvcContrib.TestHelper.WatiN which appears to depend on WatiN 1.3. This is on a Windows 7 64-bit machine. My colleague has the same configuration and is able to run our tests without this error.</p> <pre><code>TearDown : System.InvalidCastException : Unable to cast COM object of type 'mshtml.HTMLDocumentClass' to interface type 'mshtml.DispHTMLDocument'. This operation failed because the QueryInterface call on the COM component for the interface with IID '{3050F55F-98B5-11CF-BB82-00AA00BDCE0B}' failed due to the following error: No such interface supported (Exception from HRESULT: 0x80004002 (E_NOINTERFACE)). at System.RuntimeType.InvokeDispMethod(String name, BindingFlags invokeAttr, Object target, Object[] args, Boolean[] byrefModifiers, Int32 culture, String[] namedParameters) at System.RuntimeType.InvokeMember(String name, BindingFlags bindingFlags, Binder binder, Object target, Object[] providedArgs, ParameterModifier[] modifiers, CultureInfo culture, String[] namedParams) at System.RuntimeType.ForwardCallToInvokeMember(String memberName, BindingFlags flags, Object target, Int32[] aWrapperTypes, ref MessageData msgData) at mshtml.HTMLDocumentClass.get_readyState() at WatiN.Core.WaitForComplete.WaitWhileDocumentStateNotComplete(IHTMLDocument2 htmlDocument) at WatiN.Core.WaitForComplete.WaitForCompleteOrTimeout() at WatiN.Core.IEWaitForComplete.DoWait() at WatiN.Core.DomContainer.WaitForComplete(IWait waitForComplete) at WatiN.Core.IE.WaitForComplete() at WatiN.Core.IE.CreateNewIEAndGoToUri(Uri uri, LogonDialogHandler logonDialogHandler, Boolean createInNewProcess) at WatiN.Core.IE..ctor() </code></pre>
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    1. USKevin Krueger
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    1. COQuestion has been answered here: http://stackoverflow.com/questions/5664880/watin-unable-to-cast-com-object-exception
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      1. USJawad
 

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